Vector

http://www.flickr.com/photos/agder/2783124139

Virus

http://www.flickr.com/photos/blahman/284050321

Hospital

http://www.flickr.com/photos/vitortadf/56297468

Vaccination

http://www.flickr.com/photos/joeflintham/4823998129

Quarantine

http://www.flickr.com/photos/80375783@N00/5865935769

AIDS

http://www.flickr.com/photos/31817577@N07/2989606476

DOCTOR

http://www.flickr.com/photos/digital_culture/4007496605

Bacteria

http://www.flickr.com/photos/14833125@N02/3700546726

Smallpox

http://www.flickr.com/photos/micro_chan/5725780588

Fungi

http://www.flickr.com/photos/film_images/5943835973